Mounting for incandescent lamps



R. F. STRICKLAND. MOUNTING FOR INCANDESCENT LAMPS.

APPLICATION FILED MAR-6,1917- Patented Apr. 5, 1921.

JNyEJxz-TUR ROYAL f? Snatch-LAND,

.Ffzs ATTORN Y.

- ROYAL r. STBICKLAZND, or CLEVELAND, omo, ASSIGNOR 'ro GENERAL ELECTRIC comm, A CORPORATION or NEW YORK.

MOUNTING FOR INCANDESCENT LAJY IPS.

To all'wfiomit may concerm Be it known that I, 'RoYAn F. STRIGKLAND, a citizen of the United States, residing at Cleveland, in the county of Guyahoga, State of Ohio, have invented certain new and use ful Improvements in Mountings for Incandescent Lamps, of whichthe following is a specification.

My invention relates to projection apparatus and especially to an incandescent lamp and mounting for use in such apparatus.

My invention is particularly useful in moving picture projection apparatus employing an incandescent filament lamp of the monoplane type. In order to secure the highest efliciency in operation it is necessary that the plane of the monoplane filament be disposed at right angles to the optical axis of the apparatus and in prior devices the lamp mountings have the disadvantage that the lamp filament is often improperly alined with reference to the optical axis due to the inaccuracies of the lamp base and receptacle, and especially is this true in the screw base and socket type of lamp mounting. Even when the greatest care is exercised in positioning and alining the socket or receptacle upon inserting the lamp inithe receptacle and screwing it home it often occurs that the plane of the filament is in-' clined to the optical axis of the apparatus. By my invention I avoid this difficulty and insure that the monoplane filament is at all times properly alined with reference to the moving picture projection apparatus. I accomplish this by means of aparticular kind of base and mounting for the base whereby it is impossible to insert the lamp in any other than the correct position with reference to the axis. More particularly I provide on the lamp 'or' lamp base a' centering or alining means whose position is predetermined in such a manner with reference to the filament plane and to the lamp support that by the mere act of inserting the lamp in the receptacle the monoplane filament is thereby accurately positioned and alined to obtain! the maximum efliciencya According to the preferred arrangement the alining means comprises the leading-in conductors themselves which project through and beyond-the lamp base and are adapted to be I received by clamp sockets, the arrangement being such that the'lamp is prop,-

Specification of Letters Patent.

' connected. multiple erly alined upon the insertion of the leading-in wires into the sockets and-the clamping, thereof securely in position. This ar-,

tion reference may be had to the drawings Patented Apr. 5, 1921.

Application filed March 6, 1917. Serial No. 152,774.

accompanying this application, Figure 1 of which shows a side view of the lamp and lamp mounting. Fig. 2 is a sectional view thereof. Fig. 3 is a plan view of the lamp mounting and Fig. 4 is a conventional illustration of the lamp andv lamp mounting in use with a moving picture projection apparatus.

Referring to the drawings, a lamp 1 is illustrated containin a proposed parallel plane type, this filament 2 bein mounted therein on suitable supports 3. hese supports 3 are electrically connected with the outside supports and conductors 4, both these supports 3 and 4: being of large enough cross-section to carry a large. current which amounts in some cases to amperes. These external supports and conductors 4 are.

adapted to be received by lamp mounting comprising an insulatingbase 5 and insulat-.

ing standard 6, this mounting being adapted to be inserted and fixed into the lamp housing 7 of a moving picture projection ap-, paratus, the apparatus comprising a film 8 and an objective 9, and screen 10. The

standard 6 of the lamp mounting has fixed to the opposite'sid'es thereof the conducting plates 11, the attachment being made 1n. any

lament of'the monoconvenient manner as for instance by the v screw bolts whose heads are countersunk 1n the insulating standard 6, as illustrated in dotted lines. These plates 11 have attached thereto the screws 12 which receive two thumb clamping nuts, as illustrated, forclamping the conductors 4 between -the plates 11 and the plates 13. These plates- 11 and 13 conveniently have vertical grooves therein which face each other and receive the conductors 4' and the screws 12 have apertures registering with'these grooves for permitting the conductors to pass therethrough. The. conducting plates 11 on their free ends carry, as illustrated, suitable termlnals for connection with the wit. In the operation of applicants device the lamp mounting is located in the lamp housing 7 or is adapted to be easily mounted therein with the lamp 1 When a lamp burns out all the operator has to do is to insert a new lamp in a receptacle vacated by the burned out lamp which is easily accomplished by manipulation of the thumb nuts I "on the screws 12, the leading-in wires or the difficulties encountered in prior supports 4 insuring that the plane of the monoplane filment 2 is at right an les to the axisof the projection apparatus. oreover,

due to poor contact between the lamp base and the socket usually due to soldering troubles are entirely eliminated, as a perfect contact of sufficient area is obtained between the conductors 4 and the clamping plates 11 and 13 to avoid undue heating of the lamp base. It will be obvious that the height of the filament tube'above the-base 5 may be accurately fixed by causing the conductors 4; to contact with said base as shown in Fig. 2.

What I claim as new and desire to secure by Letters I atent of the United States, is:

1. In an illuminating. arrangement for projection apparatus the combination of an incandescent lamp having a monoplane filaf ment and a iamp mounting, with leading-in conductors projecting through the lamp base and serving as supports therefor adapted to be received by sockets in the lamp mounting whereby the lamp may be properly aliiied with reference to the optical axis of the supply cirdevices I projection apparatus merely by the insertion of the lamp leads in the socket.

2. In an illuminating arrangement for projection apparatus the combination of an incandescent lamp having a monoplane filament and a lamp mounting, with leading-in conductors projecting through the lamp base and serving as supports therefor adapted to be received by sockets in the lamp mounting whereby the lamp may be properly alined with reference to the optical axis of the pro jection apparatus merely by the insertion of the lamp leads in the socket, said sockets comprising clamping plates and a screw passing through said plates and apertured to receive one of-said conductors and a nut engaging said screw and adapted to clamp said plates against said conductors.

3. In an illuminating arrangement .for projection apparatus the combination of an incandescent lamp having a filament designed so that the light rays emanating therefrom will be at a maximum in a single direction, said lamp having leading-in conductors definitely disposed with reference to said filament projecting through the base thereof and serving as supports therefor and a lamp mounting comprising holding means for receiving the ends of said conductors whereb a lamp may be properly alined with reference to the aforesaid direction by the insertion of the said conductors in the said holding means. i

In witness whereof, I have hereunto set my hand this 3rd day of March, 1917. 

